1 /* 2 * Common definitions across all variants of ICP and ICS interrupt 3 * controllers. 4 */ 5 6 #ifndef _XICS_H 7 #define _XICS_H 8 9 #include <linux/interrupt.h> 10 11 #define XICS_IPI 2 12 #define XICS_IRQ_SPURIOUS 0 13 14 /* Want a priority other than 0. Various HW issues require this. */ 15 #define DEFAULT_PRIORITY 5 16 17 /* 18 * Mark IPIs as higher priority so we can take them inside interrupts 19 * FIXME: still true now? 20 */ 21 #define IPI_PRIORITY 4 22 23 /* The least favored priority */ 24 #define LOWEST_PRIORITY 0xFF 25 26 /* The number of priorities defined above */ 27 #define MAX_NUM_PRIORITIES 3 28 29 /* Native ICP */ 30 #ifdef CONFIG_PPC_ICP_NATIVE 31 extern int icp_native_init(void); 32 extern void icp_native_flush_interrupt(void); 33 extern void icp_native_cause_ipi_rm(int cpu); 34 #else 35 static inline int icp_native_init(void) { return -ENODEV; } 36 #endif 37 38 /* PAPR ICP */ 39 #ifdef CONFIG_PPC_ICP_HV 40 extern int icp_hv_init(void); 41 #else 42 static inline int icp_hv_init(void) { return -ENODEV; } 43 #endif 44 45 /* ICP ops */ 46 struct icp_ops { 47 unsigned int (*get_irq)(void); 48 void (*eoi)(struct irq_data *d); 49 void (*set_priority)(unsigned char prio); 50 void (*teardown_cpu)(void); 51 void (*flush_ipi)(void); 52 #ifdef CONFIG_SMP 53 void (*cause_ipi)(int cpu, unsigned long data); 54 irq_handler_t ipi_action; 55 #endif 56 }; 57 58 extern const struct icp_ops *icp_ops; 59 60 /* Native ICS */ 61 extern int ics_native_init(void); 62 63 /* RTAS ICS */ 64 #ifdef CONFIG_PPC_ICS_RTAS 65 extern int ics_rtas_init(void); 66 #else 67 static inline int ics_rtas_init(void) { return -ENODEV; } 68 #endif 69 70 /* HAL ICS */ 71 #ifdef CONFIG_PPC_POWERNV 72 extern int ics_opal_init(void); 73 #else 74 static inline int ics_opal_init(void) { return -ENODEV; } 75 #endif 76 77 /* ICS instance, hooked up to chip_data of an irq */ 78 struct ics { 79 struct list_head link; 80 int (*map)(struct ics *ics, unsigned int virq); 81 void (*mask_unknown)(struct ics *ics, unsigned long vec); 82 long (*get_server)(struct ics *ics, unsigned long vec); 83 int (*host_match)(struct ics *ics, struct device_node *node); 84 char data[]; 85 }; 86 87 /* Commons */ 88 extern unsigned int xics_default_server; 89 extern unsigned int xics_default_distrib_server; 90 extern unsigned int xics_interrupt_server_size; 91 extern struct irq_domain *xics_host; 92 93 struct xics_cppr { 94 unsigned char stack[MAX_NUM_PRIORITIES]; 95 int index; 96 }; 97 98 DECLARE_PER_CPU(struct xics_cppr, xics_cppr); 99 100 static inline void xics_push_cppr(unsigned int vec) 101 { 102 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 103 104 if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1)) 105 return; 106 107 if (vec == XICS_IPI) 108 os_cppr->stack[++os_cppr->index] = IPI_PRIORITY; 109 else 110 os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY; 111 } 112 113 static inline unsigned char xics_pop_cppr(void) 114 { 115 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 116 117 if (WARN_ON(os_cppr->index < 1)) 118 return LOWEST_PRIORITY; 119 120 return os_cppr->stack[--os_cppr->index]; 121 } 122 123 static inline void xics_set_base_cppr(unsigned char cppr) 124 { 125 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 126 127 /* we only really want to set the priority when there's 128 * just one cppr value on the stack 129 */ 130 WARN_ON(os_cppr->index != 0); 131 132 os_cppr->stack[0] = cppr; 133 } 134 135 static inline unsigned char xics_cppr_top(void) 136 { 137 struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); 138 139 return os_cppr->stack[os_cppr->index]; 140 } 141 142 DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message); 143 144 extern void xics_init(void); 145 extern void xics_setup_cpu(void); 146 extern void xics_update_irq_servers(void); 147 extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join); 148 extern void xics_mask_unknown_vec(unsigned int vec); 149 extern irqreturn_t xics_ipi_dispatch(int cpu); 150 extern void xics_smp_probe(void); 151 extern void xics_register_ics(struct ics *ics); 152 extern void xics_teardown_cpu(void); 153 extern void xics_kexec_teardown_cpu(int secondary); 154 extern void xics_migrate_irqs_away(void); 155 extern void icp_native_eoi(struct irq_data *d); 156 #ifdef CONFIG_SMP 157 extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask, 158 unsigned int strict_check); 159 #else 160 #define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server) 161 #endif 162 163 164 #endif /* _XICS_H */ 165